Menu does not display full width

I have 2 mega menus – Shop and Collections – located on my main navigation menu.

The menu does not display the full width – the right hand portion of the menu is cut off. The mega panel width is set to 742. No matter what I do with the section (full width, boxed) it makes no difference.
The only way to see the full menu is if I “stretch” it – but I don’t like the look of that.
I am using Ocean WP theme.

The page I need help with: [log in to see the link]